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Note 16 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net (loss) gain on sale of securities $ (4) $ (657) $ 388 $ 25 $ (79) $ 1 $ (661) $ 335 $ 144
Net impairment losses recognized in earnings                 4,646
Income before income taxes 11,933 11,546 9,377 9,257 10,042 9,613 9,277 9,013 42,113 37,945 35,921
Income tax expense $ 10,720 $ 3,894 $ 2,959 $ 3,055 $ 3,638 $ 3,230 $ 3,022 $ 2,929 20,628 12,819 11,381
Net income                 21,485 25,126 24,540
Net income                 575 2,865 113
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Income before income taxes [1]                 228 226 260
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Income before income taxes [1]                 31 47 66
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Income before income taxes                 259 273 326
Income tax expense                 (97) (102) (123)
Net income                 162 171 203
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Net (loss) gain on sale of securities                 661 (335) (144)
Net impairment losses recognized in earnings                 4,646
Income before income taxes                 661 4,311 (144)
Income tax expense                 (248) (1,617) 54
Net income                 $ 413 $ 2,694 $ (90)
[1] Amortization is included in net periodic pension cost. See Note 13, "Employee Benefit Plans."